💄 style(passengers): update navbar style for add passenger page

- change navbar preset from default to primary for consistent styling

mini/src/pages/passengers/add-passenger.tsx

@@ -141,7 +141,7 @@ const AddPassengerPage: React.FC = () => {
         title="添加乘车人"
         leftIcon="i-heroicons-arrow-left-20-solid"
         onClickLeft={() => Taro.navigateBack()}
-        { ...NavbarPresets.default }
+        { ...NavbarPresets.primary }
       />
 
       <ScrollView className="flex-1 px-4 py-4 box-border">